30results about How to "Reduce the probability of transmission failure" patented technology

The invention discloses a method for dynamically utilizing data packet aggregation transmission based on a network state, for mainly solving the problem that the performance of a network is degraded when data packet aggregation transmission is used under the condition that the network is not in a good state in the prior art. According to the scheme, the method comprises the following steps: firstly, counting the collision occurrence rate p of the network within present time through a wireless access point AP, setting a collision occurrence rate threshold th, subsequently comparing the collision occurrence rate p with the collision occurrence rate threshold, if p is greater than th, transmitting a single data packet at a wireless station and the wireless access point AP, and if p is less than or equal to th, packaging a plurality of data packets handed down from an upper computer into one medium access control (MAC) frames for transmitting through the wireless station and the wireless access point AP. By adopting the method, the data transmission time delay of the network is reduced, the performance of the network is improved, and the method can be applied to heavy-load network communication.

The invention discloses a method, device and system for realizing cross-computer room data transmission. The method includes: putting the data to be sent in the computer room of the sending party into the sending buffer; sending a notification of preparing to receive data to the computer room of the receiving party, and receiving the status information of the receiving buffer returned by the computer room of the receiving party; according to the status of the receiving buffer information, and send the data in the sending buffer to the receiver's computer room side. In the technical solution of the present invention, since the sender will perform data transmission according to the ability of the receiver, the probability of data transmission failure can be reduced, thereby reducing the number of data retransmissions and improving the efficiency of data transmission.

The invention provides a cognitive radio multi-channel measurement and control (MAC) protocol. The protocol has the basic thought of improving network performance by using the characteristic of dynamic change of frequency spectrum of a cognitive radio multi-channel environment. At a frequency spectrum cognition stage, the protocol discovers available idle frequency spectrum in a synchronous time slot mode by adopting a method for perceiving the frequency spectrum in sequence by a controller. Meanwhile, the protocol defines the channel availability, and preferably selects an idle channel with high availability for data transmission. The protocol ensures reduction of cognitive user conflicts and reliability of data channels in a cognitive radio network so as to improve the throughput of the cognitive radio network.

The invention discloses a request message transmission method and device, which are used to solve the problem that in the prior art, when an ICT network transmits a request message, the probability of request message transmission failure is increased and the reliability of request message transmission is reduced. The method is as follows: the distributor determines the corresponding first driver adaptation plug-in group according to the information of the first controller contained in the received request message, and the first controller and the first driver adaptation plug-in group contain connected to at least one driver adaptation plug-in; the distributor screens out at least one candidate driver adaptation plug-in whose operating status is normal from the at least one driver adaptation plug-in, and finally distributes all The request message is sent to the first controller. In this way, it is ensured that the distributor can successfully transmit the request message to the first controller through the target driver adaptation plug-in.

The invention discloses a deep-space network routing method with a QoS (Quality of Service) assurance, and solves the problem in the prior art that deep-space network service requirements can not be satisfied. The method particularly comprises the following steps: acquiring all link information in the network at first, correcting the communication time slots, then bringing link transmission time delay and link transmission rate into consideration to calculate the transmission time slots, and finally, calculating the path time delay according to the path transmission time to select the minimal path as the optimal path. By adopting the method, the calculated and acquired path time delay is more accurate, the selected optimal path has the shortest time delay, and the QoS requirement for the time delay of the service can be satisfied while the service throughput is guaranteed; and the service transmission time can be set more reasonably, the data transmission blindness is small, the probability of false transmission due to disconnection of links when data is transmitted on the links is low, and the network performance is improved.

The invention discloses a method of disposing an internal collision of enhanced distributed channel access and solves the problems that unfair of low priority caused by the internal collision in the prior art. The steps comprises that firstly, a high priority queue directly sends data; secondly, a low priority queue chooses to retreat or send the data again due to the fact that whether the high priority queue is succeed in sending the data or not; and finally, whether the data is sent or not is determined according to the number of queues to be sent in nodes. A simulation result proves that the method of disposing the internal collision of the enhanced distributed channel access has the advantages of reducing time delay of sending the data through the nodes, guaranteeing the throughput of business, simultaneously satisfying service quality need of time delay from the business, reducing outer collision probability of sending the data through the nodes, reducing the number of failures caused by outer collision during the link transmitting of the data and improving the property of a communication network.

The invention discloses a method for dynamically setting the minimum contention window value of a node according to the number of retransmission times, which mainly solves the problem in the prior art that the static setting of the minimum contention window value causes network performance to decline. The implementation steps are: 1) the node sends the current data packet, and records the number of retransmissions it successfully sent; 2) compares the recorded number of retransmissions with the two set thresholds: when the number of retransmissions is less than the first threshold value, set the minimum contention window value to the default minimum contention window value in the communication standard; when the number of retransmissions is greater than the first threshold and less than the second threshold value, set the minimum contention window value to the default minimum α times the contention window value; when the number of retransmissions is greater than the second threshold, set the minimum contention window value to β times the default minimum contention window value in the communication standard; 3) After the minimum contention window value is set, the node continues to compete channel. The invention reduces the time delay of nodes sending data and improves the performance of communication network.

The invention discloses a Zigbee information channel dynamic selection method based on real-time availability. In the invention, the concept of information channel availability is provided for the first time, the information channel availability is updated by the availability algorithm in real time, and information channels can be dynamically selected according to availability sequence in an information channel resource pool, which is marked by a broken line in the figure. Parameters for the information channel availability indicate the vacancy rate and communication quality of the information channel and show practical available conditions of the information channel. Therefore, the parameters for the information channel availability can be used for guiding selection of the information channel in practical data transmission, so as to provide a communication support, increase the data transmission success rate, and reduce the collision rate and retransmission rate to the largest extent. Based on the vacancy rate and quality of the information channel, data transmission results and other parameters, the invention provides the real-time availability algorithm. The real-time availability algorithm not only provides a high-quality vacant information channel with more selection chances, but also ensures the fairness of information channel selection to the largest extent and enables the information channel to be selected by relative fair chance, thereby improving the utilization rate of the information channel. In the invention, the strategy to build the information resource pool to manage information channel resources is provided; information channels are sequenced based on the parameters for the information channel availability; and the ZigBee information channel is selected according to the sequencing result, thereby realizing the Zigbee information channel dynamic selection method based on real-time availability.

The invention discloses a frequency pulse selector and selection method. The frequency pulse selector comprises a complex programmable logic device (CPLD), a lower computer and a menu selector, wherein the lower computer is connected with the input end of the CPLD, and the menu selector is connected with the output end of the CPLD. An upper computer comprises a data providing module, and the data providing module is used for providing first communication data. The lower computer comprises a data conversion module, the data conversion module is used for generating fractional frequency signals corresponding to the number of fractional frequencies and generating monocycle pulse signals corresponding to the monocycle pulses in number. The CPLD is used for receiving clock signals, generating control signals according to the fractional frequency signals, the monocycle pulse signals and the clock signals and sending the control signals to the menu selector. The frequency pulse selector and selection method can change output multiple pulses and the number of the monocycle pulses of a laser without adjusting a hardware circuit, thereby avoiding signal control abnormity caused by failures of the hardware circuit.

The invention discloses a transmission control method based on differentiated service in the IEEE 802.11 WLAN, belonging to the technical field of the wireless mobile ad hoc network data stream. The data streams in the mobile ad hoc network are divided into the data stream which is sensitive to the time delay and the data stream which is not sensitive to the time delay and the two kinds of data streams are marked respectively; an MAC layer packet retransmission counter is adopted in the process of sending and forwarding nodes; the retransmission times of data packets are saved on the head of the MAC frame of the data packets which need to be sent or forwarded; a packet control mechanism is adopted at the exit of the node interface queue so that the data packets are sent and forwarded differently according to the priority of the data packets; and the sent nodes are made to double the contention window thereof or minimize the contention window according to the successful or failed sending of the data packets of the two kinds of data streams, wherein the sent nodes minimize the contention window thereof after the data packets of high priority or the data packets of low priority are retransmitted for the maximum times. The transmission control method can make the data stream of high priority occupy more bandwidth resources and can reduce the transmission time delay and the loss rate of the data packets.

Provided by the embodiments of the present application is a method for transmitting data, comprising: a network device sending first indication information to a terminal device in a first query area, the first indication information being used to indicate the distribution of transmission resources in an unauthorized transmission area corresponding to the first query area; the network device receiving data sent by the terminal device according to the first indication information in the unauthorized transmission area corresponding to the first query area, which thus helps improve the reliability of transmitting data.

The present invention relates to a data transmission method, device, computer equipment and storage medium. The method includes: acquiring target data to be transmitted; dividing the target data into k sub-data to be transmitted, where k is greater than An integer of 1; respectively establish data transmission channels with N target servers in the server set, and the N is an integer greater than 1; send a data transmission request to the corresponding target server through the data transmission channel, and in the data transmission request Carrying one or more sub-data, so that each target server stores the received sub-data on a preset storage device. The above method can improve the transmission efficiency and reduce the transmission time.